On what Biblical basis did Mormon prophet Joseph Smith teach that the "Ancient of Days" at Daniel 7:22 is the first man Adam?

The following is what he stated. "Postmortality One of Adam’s duties in his postmortal role as father of the human race is to help prepare his posterity for the coming of the Lord Jesus Christ. Daniel 7:22 [Dan. 7:22] speaks of the return of the Ancient of Days, which the Prophet Joseph Smith said “means the oldest man, our Father Adam, Michael, [who] will call his children together and hold a council with them to prepare them for the coming of the Son of Man” (Teachings, 157). This preparatory council will be held at Adam-ondi-Ahman (see D&C 116:1; Teachings, 122) and will be attended by the Savior (see Teachings, 158)." Also, Smith says that Michael, will call his children together and hold a council with them to prepare them for the coming of the Son of Man. This preparatory council will be held at "Adam-ondi-Ahman." According to Mormon sources this council meeting will take place at "Adam-ondi-Ahman." This is a historic site in Daviess County Missouri, about five miles south of Jameson. It is located along the east bluffs above the Grand River. According to Daniel 7:1 and the entire context of Daniel 7, Daniel has a dream/visions of God at judgment. This "begs" the question, who has visions of Adam being the "Ancient of Days" and calling for a council meeting in the state of Missouri?